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  1. #1
    Established Member Two Rings Reggieroo's Avatar
    Join Date
    Sep 15 2010
    AZ Member #
    64115
    My Garage
    2000 Audi S6 Avant, 93 V8 Range Rover classic.
    Location
    Worcestershire, UK

    allroad-Coolant symbol flashes in the morning when cold!

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    On a few occasions now that the cold weather is starting to creep in, the coolant symbol flashes on a cold morning after start up. It flashes for a few minutes then goes out & only does it if it's a cold morning, you can start it in the afternoon when the weather is warmer & nothing flashes up.

    I looked it up in he drivers manual & it say that it's either coolant level too low or the coolant temp is too high. I've checked the coolant level (an hour after using it) & it was fine, I put a spot in as I thought maybe when it's cold it goes down a little but the symbol still flashes up for a few minutes on cold mornings. It's obviously not temperature too high so could it be?

  2. #2
    Established Member Two Rings
    Join Date
    Jul 19 2009
    AZ Member #
    45189
    My Garage
    03 2.7T A6 6MT
    Location
    Marlton, NJ

    When this happened to me, it was my coolant level low and it was because my aux pump was leaking. I had a spot on the ground in the middle of the car at the back of the engine bay. I have no answer for warm vs cold except for possible expansion that keeps the sensor happy when it's warmer out. You can also try and look underneath the manifold to see if you see pink coolant. If you do, your aux pump is leaking.

  3. #3
    Veteran Member Three Rings PaperToast's Avatar
    Join Date
    Apr 29 2009
    AZ Member #
    41811
    My Garage
    Quadzilla
    Location
    Longmont, CO

    my guess is that the coolant level sensor is on its way out

    they tend to do that flashing thing when they are failing
    the oil level sensor on my ar does similar things
    Rockin' the Rockies
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  4. #4
    Senior Member Three Rings mithril's Avatar
    Join Date
    Jul 23 2010
    AZ Member #
    61808
    Location
    Vancouver, BC

    What is the coolant level in the morning before you start the car? (ie. when it's completely cold) You coolant level will always be slightly lower when cold than when at operating temp, that's why you're always s'posed to fill when cold, and that difference could be enough to trip the coolant level sensor.

  5. #5
    Established Member Two Rings Reggieroo's Avatar
    Join Date
    Sep 15 2010
    AZ Member #
    64115
    My Garage
    2000 Audi S6 Avant, 93 V8 Range Rover classic.
    Location
    Worcestershire, UK

    Quote Originally Posted by mithril View Post
    What is the coolant level in the morning before you start the car? (ie. when it's completely cold) You coolant level will always be slightly lower when cold than when at operating temp, that's why you're always s'posed to fill when cold, and that difference could be enough to trip the coolant level sensor.
    That's exactly what I thought, wanted to wait till the morning to check but the misses goes out before I'm up so will have to do it Saturday morning. I'll check it then & see if it's a tad low.

  6. #6
    Senior Member Three Rings mithril's Avatar
    Join Date
    Jul 23 2010
    AZ Member #
    61808
    Location
    Vancouver, BC

    Ya I've had this cold start coolant level issue happen several time in various VAG cars, it's always been that the coolant levels are low and liquid contraction is enough to trip the sensor. Hell, I've saw a similar issue with brake fluid level in my C5 after a flush. I guess some air had worked its way back to the reserviour and dropped the levels slightly. Normally never an issue, but if I started with a full WOT launch and immediately hit the brakes hard it the change in motion would be enough to slosh the fluid and trip the brake warning light. A top-up was all that was required to sort that issue out too.

  7. #7
    Established Member Two Rings Reggieroo's Avatar
    Join Date
    Sep 15 2010
    AZ Member #
    64115
    My Garage
    2000 Audi S6 Avant, 93 V8 Range Rover classic.
    Location
    Worcestershire, UK

    Checked it in the morning before start up & the coolant level is fine.

  8. #8
    Established Member Two Rings Reggieroo's Avatar
    Join Date
    Sep 15 2010
    AZ Member #
    64115
    My Garage
    2000 Audi S6 Avant, 93 V8 Range Rover classic.
    Location
    Worcestershire, UK

    Noticed something odd today. I started it up, the coolant light came on again so I went on with the journey & noticed that the temp gauge hadn't moved but stayed on 60. I also had the climate on high but it never got that hot in there as expected. I looked it up in the manual & it says that the gauge should go midway to about 90.

    Wondering now if I have a dodgy thermostat?

  9. #9
    Senior Member Three Rings JoeM's Avatar
    Join Date
    Nov 01 2007
    AZ Member #
    22243
    Location
    Vancouver, Wa

    This is for 2005's but wonder if it is something similar...

    http://uberlame.com/a6_tsb/Coolant%2...%20weather.pdf
    -Joe-
    '08 A4 2.0T Q
    '01 Land Rover Disco II
    '99 Porsche Boxster

  10. #10
    Established Member Two Rings Reggieroo's Avatar
    Join Date
    Sep 15 2010
    AZ Member #
    64115
    My Garage
    2000 Audi S6 Avant, 93 V8 Range Rover classic.
    Location
    Worcestershire, UK

    Quote Originally Posted by JoeM View Post
    This is for 2005's but wonder if it is something similar...

    http://uberlame.com/a6_tsb/Coolant%2...%20weather.pdf
    Interesting reading.



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